+++ /dev/null
-;; ====================================================================\r
-;; Macros\r
-;; ====================================================================\r
-;; Jump if key pressed\r
-JKEYP MACRO key,label\r
- cmp byte ptr cs:_keyFlags[key+1],1\r
- je label\r
- ENDM\r
-;; Jump if key not pressed\r
-JKEYNP MACRO key,label\r
- cmp byte ptr cs:_keyFlags[key+1],1\r
- jne label\r
- ENDM\r
-\r
-;; Note that JNKEY and JKEY both modify _flKeyChanged, so you cannot\r
-;; use one after the other! In other words,\r
-;; JKEYNP no_key\r
-;; JKEYP yes_key ;<-- this will fail\r
-;; will not work like you'd think it would. The second call (JKEYP)\r
-;; will not know that a key has been pressed!\r
-;; Jump if no key pressed:\r
-JNKEY MACRO label\r
- cmp cs:_flKeyChanged,0\r
- je label\r
- mov cs:_flKeyChanged,0 ; <--- important!\r
- ENDM\r
-;; Jump if key pressed:\r
-JKEY MACRO label\r
- cmp cs:_flKeyChanged,0\r
- mov cs:_flKeyChanged,0\r
- jne label\r
- ENDM\r
-\r
-;; Start keyboard interrupts\r
-KEYB_START MACRO\r
- call SwapInt9\r
- mov cs:_flKeyChanged,0\r
- ENDM\r
-\r
-;; Clear keyboard interrupts\r
-KEYB_END MACRO\r
- call SwapInt9\r
- ENDM\r
-\r
-;; Credit for these routines: Steve Dollins, Brown Computer Group.\r
-;; I didn't write any of the code below -- just heisted it from some\r
-;; stuff that he wrote and released! Very useful keyboard routines.\r
-;; Any comments prefixed SDE were added by me.\r
-_keyFlags dw 256 dup (0) ; SDE: since they only use 2 bits\r
- ; per word, this is a tradeoff,\r
- ; space for time\r
-\r
-oldint9_offset dw offset newint9\r
-oldint9_segment dw seg newint9\r
-\r
-_flKeyChanged dw 0\r
-\r
-;-----------------------------------------------------------------------\r
-; void SwapInt9( void )\r
-;\r
-; SwapInt9() exchanges the vector in oldint9_segment:oldint9_offset\r
-; with the vector in the interrupt table for INT 9h.\r
-;-----------------------------------------------------------------------\r
-\r
-SwapInt9 PROC far\r
- mov ax,cs\r
- mov ds,ax\r
-\r
- mov ax,03509h ; Get interrupt 09h\r
- int 21h ; return in ES:BX\r
-\r
- mov ax,oldint9_segment\r
- mov dx,oldint9_offset\r
- push ds\r
- mov ds,ax\r
- mov ax,02509h ; Set new interrupt\r
- int 21h ; to address in DS:DX\r
- pop ds\r
-\r
- mov oldint9_segment,es ; Save the old interrupt\r
- mov oldint9_offset,bx\r
- ret\r
-SwapInt9 ENDP\r
-\r
-\r
-;-----------------------------------------------------------------------\r
-; newint9 is the new keyboard interrupt (INT 9h).\r
-;\r
-; Reads the scan code from the keyboard and modifies the key\r
-; flags table. The high byte is set to the position of the key,\r
-; pressed=1, release=0. The low byte is set to 1 when the key\r
-; is pressed and left unmodified when the key is released.\r
-;-----------------------------------------------------------------------\r
-newint9 PROC far\r
- push ax\r
- push bx\r
- push ds\r
-\r
- mov ax,cs\r
- mov ds,ax\r
-\r
- JKEYNP kCTRL,not_ctrlaltdel ; SDE code\r
- JKEYNP kALT,not_ctrlaltdel ; To still allow ctrl-\r
- JKEYNP kDELETE,not_ctrlaltdel ; alt-delete. Nothing\r
- jmp ctrlaltdel ; worse than a total lockup!\r
-not_ctrlaltdel:\r
-\r
- in ax,60h ; get scan code in AL, control byte in AH\r
- mov bx,ax ; save a copy in BX\r
- xchg ah,al ; swap to get control byte in AL\r
- or al,80h ; clear keyboard\r
- out 61h,al ; of interrupt\r
- and al,7Fh\r
- out 61h,al\r
- mov al,20h ; send generic EOI to\r
- out 20h,al ; PIC\r
-\r
- and bx,0007fh ; strip all but the scan code\r
- shl bx,1 ; multiply by two to get our offset\r
-\r
- ; if the key was released, the high bit is set in the scan code\r
- bt ax,15 ; move this high bit into the carry flag\r
- setnc byte ptr [_keyFlags+bx+1] ; set "Is being pressed" flag\r
- jc short int09done ; if the key was released, we're done\r
- mov byte ptr [_keyFlags+bx],1 ; set "Has been pressed" flag\r
- mov _flKeyChanged,1 ; state of keyboard has changed\r
-int09done:\r
- mov _flKeyChanged,1 ; state of keyboard has changed\r
- pop ds\r
- pop bx\r
- pop ax\r
- iret\r
-ctrlaltdel: int 19h ; SDE -- added this.\r
- ; Allows a reboot.\r
-newint9 ENDP\r
-\r
-;; Defines the current key procedure (used as a jump-through)\r
-kprocCur dw KprocDirect\r
-\r
-;; This is a keyboard procedure. Normally, this would control some\r
-;; sprite, or something, and the screen would follow the sprite. For\r
-;; the purposes of this code, though (namely, sprite-less scrolling)\r
-;; it just directly affects ScrollDX and ScrollDY.\r
-;; This keyproc is inertialess, use + and - to increase speed and\r
-;; the up/down/left/right keys to move directions.\r
-;; Pressing K will switch to the other keyprocedure on the fly.\r
-;; P pauses the screen -- note that this is just for completely\r
-;; freezing the screen... it doesn't return until you let go!\r
-\r
-EVEN\r
-scroll_speed_x dw SCROLL_SPEED ; (defaults)\r
-scroll_speed_y dw SCROLL_SPEED * VIRTUAL_WIDTH ; (defaults)\r
-KprocDirect PROC near\r
-chk_leftright: mov ax,0\r
- JKEYNP kRIGHT,not_right\r
- mov ax,scroll_speed_x\r
- mov ScrollDX,ax\r
- jmp chk_updown\r
-not_right: JKEYNP kLEFT,not_left\r
- sub ax,scroll_speed_x\r
- mov ScrollDX,ax\r
- jmp chk_updown\r
-not_left: mov ScrollDX,ax\r
-\r
-chk_updown: mov ax,0\r
- JKEYNP kUP,not_up\r
- sub ax,scroll_speed_y\r
- mov ScrollDY,ax\r
- jmp chk_other\r
-not_up: JKEYNP kDOWN,not_down\r
- mov ax,scroll_speed_y\r
- mov ScrollDY,ax\r
- jmp chk_other\r
-not_down: mov ScrollDY,ax\r
-\r
-chk_other: JKEYNP kK,not_k\r
- mov kprocCur,KprocInertia\r
-not_k: JKEYNP kM,not_m\r
- mov bDoTransition,1\r
-not_m: JKEYNP kGREY_MINUS,not_minus\r
- cmp scroll_speed_x,1\r
- jle not_minus\r
- dec scroll_speed_x\r
- sub scroll_speed_y,VIRTUAL_WIDTH\r
-not_minus: JKEYNP kGREY_PLUS,not_plus\r
- cmp scroll_speed_x,16\r
- jge not_plus\r
- inc scroll_speed_x\r
- add scroll_speed_y,VIRTUAL_WIDTH\r
-not_plus:\r
-\r
-pause_key: JKEYP kP,pause_key\r
-\r
- ret\r
-KprocDirect ENDP\r
-\r
-;; This keyproc has inertia, so + and - don't work.\r
-;; Use up/down/left/right keys to increase speed in those directions.\r
-;; Pressing K will switch to the other keyprocedure on the fly.\r
-;; P pauses the screen -- note that this is just for completely\r
-;; freezing the screen... it doesn't return until you let go!\r
-KprocInertia PROC near\r
-chk2_leftright: JKEYNP kRIGHT,not2_right\r
- cmp ScrollDX,16\r
- je not2_right\r
- inc ScrollDX\r
- jmp chk2_updown\r
-not2_right: JKEYNP kLEFT,not2_left\r
- cmp ScrollDX,-16\r
- je not2_left\r
- dec ScrollDX\r
- jmp chk2_updown\r
-not2_left:\r
-\r
-chk2_updown: JKEYNP kUP,not2_up\r
- cmp ScrollDY,-VIRTUAL_WIDTH * 16\r
- je not2_up\r
- add ScrollDY,-VIRTUAL_WIDTH\r
- jmp chk2_other\r
-not2_up: JKEYNP kDOWN,not2_down\r
- cmp ScrollDY,VIRTUAL_WIDTH * 16\r
- je not2_down\r
- add ScrollDY,VIRTUAL_WIDTH\r
- jmp chk2_other\r
-not2_down:\r
-\r
-chk2_other: JKEYNP kK,not2_k\r
- mov kprocCur,KprocDirect\r
-not2_k: JKEYNP kM,not2_m\r
- mov bDoTransition,1\r
-not2_m:\r
-\r
-pause2_key: JKEYP kP,pause2_key\r
-\r
- ret\r
-KprocInertia ENDP\r
-\1a
\ No newline at end of file
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